Wash and dry the plastic lid. Paint on the head by using a paintbrush to add an almond shape at one end of the lid.
Use the handle end of a paintbrush dipped in black paint to add the spots. Make some spots larger than others. Let all the paint dry.
Use white craft glue to add the wiggle eyes.
Optional: You could make these into magnets, but you would need to fill the lid with something first. I would recommend using something lightweight, like cardboard. Cut it into circle and glue it inside the cap, then add a magnet.